JPH11337037A - Waste treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably burn wastes by adjusting the blend ratio of a plurality of types of wastes with different amounts of water so that the temperature of a compression forming object is within a specific range in each process for heating, drying, thermocompressing, and carbonizing the compression forming object of the wastes and then burning an obtained carbonization product. SOLUTION: A waste is thrown into a compression device 1 from a throwing port 20 and then a compression cylinder 2 is operated for compression formation. Then, an obtained compression forming object 10a is pressed into a tunnel-type heating furnace 4, is dried while traveling in the heating furnace, and is partially and thermally decomposed as a carbonization product 11n finally. The carbonization product 11n is thrown into a high-temperature reactor 5 by extrusion and is burned while a gas containing oxygen being blown from a blowing port 13 is being supplied. In this case, when the carbonization of the compression carbide is being delayed, the blend ratio of a plurality of types of wastes with a different amount of water is adjusted so that the blend ratio of the waste with a small amount of water in the waste being supplied to each process can be increased, thus promoting carbonization.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste treatment method for compressing waste, drying, thermally decomposing, and carbonizing the compression molded product, burning the obtained carbonized product, and melting ash. In particular, the present invention relates to a waste disposal method capable of stably treating a plurality of types of waste having different moisture contents.

[0002]

2. Description of the Related Art At present, the shortage of final waste disposal sites has become apparent, and many industrial and general wastes are incinerated and discarded as they are generated or after some pretreatment. After being contaminated, final disposal such as landfill is often performed. Various methods can be cited as the method of incineration described above, but in recent years, management of harmful substances such as dioxin in generated gas in incineration plants has become a problem, and toxic substances can be decomposed in a high-temperature atmosphere. There is a need for a processing method.

[0003] As waste treatment methods capable of such high-temperature treatment, JP-A-6-26626 and JP-A-6-79252.
And a waste disposal process disclosed in Japanese Patent Application Laid-Open No. 7-323270. These are waste treatment processes in which waste is compressed, molded, dried, thermally decomposed, carbonized, and the generated carbide is melted and gasified to obtain a fuel gas.

FIG. 5 is a side view showing the above-mentioned conventional waste treatment facility. In FIG. 5, reference numeral 1 denotes a compression device for pressurizing and compression-molding waste in a batchwise (: batch-like) manner;
2 is a compression cylinder, 3 is a compression support plate, 4 is a compression device 1
Drying the waste (hereinafter also referred to as compression molded product) obtained in
Tunnel type heating furnace for pyrolysis and carbonization, 4a is a dry area of compression molded product, 4b is a pyrolysis and carbonization area of compression molded product,
_4E is an entrance of the tunnel heating furnace 4 (hereinafter also referred to as a tunnel heating furnace entrance), _4O is an exit of the tunnel heating furnace 4 (: a charging entrance of a carbonized product into the high-temperature reactor 5) (hereinafter a tunnel). 5 is a compression molded product carbonized in the tunnel heating furnace 4 (hereinafter also referred to as carbonized product).
High-temperature reactor that combusts and melts ash, 6 is a combustion / melting zone of carbonized products (hereinafter also referred to as combustion / melting zone), 10a,
10i is a compression molded product, 11 _i and 11 _n are carbonized compression molded products (: carbonized products), 12 is a mixture of carbonized products and combustion residues, 13 is an oxygen-containing gas blowing port, 14 is a melt, 14H
Is a melt outlet, 20 is a waste inlet, 21 is a lid of the waste inlet, 50 is a quenching device for exhaust gas (hereinafter also referred to as generated gas) discharged from the high-temperature reactor 5, 51 is a gas purifier, 52 gas outlet of the high temperature reactor 5, the purified gas 53, f ₁ is the compression-molded product 10a, 10i moving direction of, f ₂ is carbonized product 11 _i,
11 _{n is} the moving direction, f ₃ is the flow direction of the pyrolysis gas generated in the tunnel heating furnace 4, f ₄ is the blowing direction of the oxygen-containing gas into the high-temperature reactor 5, f ₅ is the direction of the compression cylinder 2. The moving direction, f _6, indicates the moving direction of the compression support board 3, and f ₇ indicates the rotating direction of the lid 21 of the waste inlet 20.

In the waste treatment equipment shown in FIG. 5, first, a predetermined amount of waste supplied from the waste inlet 20 into the compression device 1 is compressed in a batchwise manner using the compression device 1. Then, a compact compression molded product 10a is obtained. Next, the compression molded product 10a is pushed into an elongated tunnel heating furnace 4 which is heated from the outside.

At this time, the water contained in the waste is
It is squeezed out in the above-described compression step and moves into the tunnel heating furnace 4 together with the waste. Cross-sectional shape of the compression molded product 10a is an inner wall section having the same shape, the same dimensions of the tunnel type heating furnace inlet 4 _E, the compression molded product pushed compression molded product 10a 10
Since a is pushed while keeping the contact state with the inner wall of the tunnel heating furnace 4, the atmosphere in the heating furnace can be sealed at the tunnel heating furnace entrance.

[0007] Each time a new compression molded product is pushed in, the compression molded product 10i slides inside the tunnel heating furnace 4 and moves. The tunnel type heating furnace 4 is heated from the outside as described above, the inner wall is heated to about 500 ° C., and during the movement and the temperature rise of the compression molded product 10i, the compression molded product 10i is dried, thermally decomposed, Carbonize.

[0008] The carbonized product 11n and gas components generated by thermal decomposition are charged and blown into the high-temperature reactor 5 maintained at 1000 ° C or higher. Thereafter, the combustibles in the carbonized product containing minerals and metals are burned by the oxygen-containing gas, pyrolyzed, and gasified. In this case, by adjusting the amount of oxygen in the oxygen-containing gas, the generated gas discharged from the high-temperature reactor 5 can be recovered as a fuel gas containing carbon monoxide and hydrogen (hereinafter also referred to as generated gas).

[0009] The residue (non-combustible portion) that is not gasified by combustion or thermal decomposition is melted in the high-temperature reactor 5 to form a molten material 14 composed of molten metal and molten slag. It is recovered from the lower melt outlet 14H.
On the other hand, as shown in FIG. 4, wastes include waste plastics, paper waste from offices and the like, crushed waste (shredder dust) generated when crushing automobiles, home electric appliances, and the like, from households and shops. There are various types of waste such as municipal waste such as garbage, organic sludge such as sewage sludge, inorganic sludge, fly ash, and industrial waste such as slag from intermediate processes of various manufacturing industries.

[0010] Therefore, when these various wastes are treated using the above-mentioned conventional waste treatment process, there are the following problems. [Problems with delay of progress of pyrolysis and carbonization in drying, pyrolysis and carbonization processes:] When treating waste such as sludge with a large amount of moisture and a low calorific value,
If only heat is supplied from the outside in the drying, pyrolysis, and carbonization steps, pyrolysis and carbonization will not proceed sufficiently, and after being extruded into the high-temperature reactor, pyrolysis and carbonization will proceed. The temperature in the reactor decreases.

If the temperature of the atmosphere in the high-temperature reactor cannot be maintained at 1000 ° C. or higher, the organic matter in the gas generated by the thermal decomposition will not be sufficiently decomposed, and the generated gas will be cooled, and the pipes will be blocked in the purification process. Cause. In such a case, as shown in FIG. 3, for example, LPG, LNG, propane gas, or the like is introduced into the high-temperature reactor 5 through a combustible gas and an oxygen-containing gas injection port 15 provided in a lower part of the furnace of the high-temperature reactor 5. Needs to be supplied separately.

Further, if the degree of thermal decomposition and carbonization in the tunnel type heating furnace is insufficient, thermal decomposition and carbonization proceed after being extruded into the high-temperature reactor, resulting in the lower part of the furnace of the high-temperature reactor. The amount of gas generated by pyrolysis increases. As a result, the gas superficial velocity in the lower part of the high-temperature reactor increases, and the ash generated by the burning of solids in the lower part of the furnace fluidizes and is entrained by the generated gas, and is discharged out of the system of the high-temperature reactor. The amount of dust increases.

[Problems in treating various wastes:]
Each of the wastes has a different amount of generation and a different timing of generation. As a result, when various wastes are sequentially treated in the waste treatment process described above, the ambient temperature in the high-temperature reactor fluctuates depending on the type of waste to be received, and accordingly, the supply amount of the fuel gas and the waste treatment It is necessary to change the amount, and it is not possible to avoid the problem that the amount of fuel gas used increases due to the decrease in thermal efficiency and the amount of waste disposal decreases.

[0014]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and does not use extra fuel for thermal compensation and reduces waste disposal without reducing waste disposal volume. It is an object of the present invention to provide a waste disposal method capable of stably burning an object and melting ash.

[0015]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems of the waste treatment process, and as a result, have maintained the gas temperature in the furnace of the high-temperature reactor at a high temperature and stably. In order to do this, it was found that the carbonization of the compression-molded product had to progress to a substantially constant degree of carbonization in the drying, pyrolysis, and carbonization steps of the compression-molded product.

However, in the ordinary continuous operation, it is difficult to directly measure the degree of carbonization of the compression molded product in the final stage of the drying, pyrolysis, and carbonization steps. The present inventors have further studied and found that the degree of carbonization is almost constant if the temperature of the carbonized product has risen to a predetermined temperature in the final stage of the drying, pyrolysis and carbonization steps of the compression molded product. I noticed that it was progressing to the extent of.

Further, for this purpose, drying of the compression molded product,
Reduce the fluctuation of latent heat of vaporization of water that requires a large amount of heat in the pyrolysis and carbonization steps, and vary the amount of water so that the temperature of the compression molded product in the drying, pyrolysis and carbonization steps falls within a predetermined range. It has been found that controlling the mixing ratio of a plurality of types of waste is effective (first invention). In addition, the fluctuation of latent heat of vaporization of moisture that requires a large amount of heat in the drying, pyrolysis, and carbonization steps of the compression molded product is reduced,
It is effective to control the compounding ratio of multiple types of wastes with different water contents so that the temperature of the carbonized product obtained in the drying, pyrolysis, and carbonization steps is in the range of 500 to 600 ° C. Do you get it.

Further, as a result of examining the processes of drying, pyrolysis and carbonization when using a tunnel heating furnace in the drying, pyrolysis and carbonization steps of the compression molded product, the following findings were obtained. In the waste treatment process described above, drying,
Thermal decomposition and carbonization are performed by external heating of a tunnel heating furnace.

Therefore, the supply of heat is performed under substantially constant conditions, and if the drying of the waste is completed at a substantially constant position in the tunnel heating furnace, the temperature will reach 500 to 600 ° C. after drying. The required distance is constant as shown in FIG. 1 described below, and the temperature of the waste in the final stage of the drying, pyrolysis and carbonization steps is maintained at 500 to 600 ° C. That is, when drying is completed, the temperature of the waste rises from about 100 ° C,
According to the processing method of waste of the present invention, since the waste is tightly compacted, a specific gravity of about 0.5 t / m ^3, the specific heat is almost constant at about 0.3 kcal / kg · ° C., Tunnel The temperature of the waste in the final stage of the tunnel heating furnace is controlled by controlling the mixing ratio of a plurality of types of waste having different moisture contents so that the drying is completed within a certain distance from the entrance of the heating furnace. Is maintained at 500-600 ° C., and pyrolysis and carbonization are completed (second invention).

That is, the first invention comprises a step of compression-molding a waste, a step of heating, drying, pyrolyzing, and carbonizing the obtained compression-molded product; and a step of burning the obtained carbonized product.
A waste disposal method having a step of melting ash,
The waste to be subjected to the compression molding is a mixture of a plurality of types of wastes having different amounts of water, and the temperature of the compression molded product in the drying, pyrolysis, and carbonizing steps is within a predetermined range. As described above, the present invention provides a waste disposal method characterized by controlling the mixing ratio of a plurality of types of waste having different moisture contents.

A more preferable aspect of the first invention is as follows.
A waste treatment method comprising a step of compression molding waste, a step of heating, drying, pyrolyzing, and carbonizing the obtained compression molded article, and a step of burning the obtained carbonized product and melting ash. The waste to be subjected to the compression molding is a mixture of a plurality of types of wastes having different moisture contents, and the temperature of the carbonized product obtained in the drying, pyrolysis, and carbonizing steps is 500. Within the range of ~ 600 ° C.
This is a waste treatment method characterized by controlling the mixing ratio of a plurality of types of wastes having different moisture contents (first preferred embodiment of the first invention).

In the above-mentioned first invention and the first preferred embodiment of the first invention, in the step of heating, drying, pyrolyzing and carbonizing the above-mentioned compression-molded product, a tunnel-type heating furnace is used. In the step of charging the compression molded product into the tunnel heating furnace, moving, drying, pyrolyzing, and carbonizing, burning the carbonized product obtained in the step and melting the ash, It is preferable to use a high-temperature reactor directly connected to the outlet of the heating furnace (second preferred embodiment of the first invention, third preferred embodiment of the first invention).

The second invention comprises a step of compression-molding the waste, and charging the obtained compression-molded product into a tunnel type heating furnace.
Moving, drying, pyrolyzing, carbonizing, and charging the obtained carbonized product into a high-temperature reactor, burning and melting the ash, the waste treatment method comprising the steps of: The waste to be molded is a mixture of a plurality of types of wastes having different moisture contents, and the following formula in the tunnel heating furnace is used.
(1) controlling the mixing ratio of the plurality of types of wastes having different moisture contents so that the temperature of the compression-molded product is at least 100 to 150 ° C. in at least any part of the region A defined in the above (1). It is a waste disposal method characterized by the following.

(2/7) L ≦ A ≦ (１ ／) L (1) [In the above formula, L indicates the distance from the entrance of the tunnel heating furnace to the exit of the tunnel heating furnace. The temperature of the compression molded product and the temperature of the carbonized product in the first invention and the first preferred embodiment of the first invention are the central temperature of the compression molded product and the central temperature of the carbonized product, respectively. Show.

In the second preferred embodiment of the first invention and the temperature of the compression molded product in the second invention, the temperature of the compression molded product is perpendicular to the moving direction of the compression molded product in the tunnel type heating furnace. And the temperature of the carbonized product in the first preferred embodiment and the third preferred embodiment of the first invention is defined as the carbonized product perpendicular to the moving direction of the carbonized product in the tunnel heating furnace. Shows the center temperature of the object section.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The present invention is a waste, compression molding, drying, pyrolysis,
In the waste treatment method of treating by carbonization, combustion, and ash melting, the degree of progress of carbonization of the compression molded product at the point of being supplied to the drying, pyrolysis, carbonization process, combustion of carbonized products, and ash melting process It is characterized by controlling the mixing ratio of a plurality of types of waste having different amounts of moisture so as to be stable.

That is, when the carbonization of the compression molded product in the drying, pyrolysis and carbonization steps is delayed, the mixing ratio of the waste having a low water content in the waste supplied to the step is increased to promote the carbonization. I do. Conversely, if carbonization of the compression-molded product in the drying, pyrolysis and carbonization steps is progressing and there is room in the area of thermal decomposition and carbonization, the amount of water in the waste supplied to the process is high. Increase the compounding ratio of the product.

The degree of carbonization of the compression molded product in the drying, pyrolysis and carbonization steps can be determined by measuring the temperature of the compression molded product in the process. In the present invention, the center temperature of the final carbonized product obtained in the drying, pyrolysis and carbonization steps is 500 to 600 ° C.
It is preferable to control the mixing ratio of a plurality of types of wastes having different amounts of water.

This is because, by setting the center temperature of the final carbonized product obtained in the above-mentioned step to 500 ° C. or higher, the organic volatile components are almost vaporized, the carbonization is completed, and the thermal decomposition and carbonization progress. There is no problem of lowering the temperature during combustion due to the delay and increase in the amount of dust generated.By setting the temperature to 600 ° C or less, it is possible to reduce the amount of heat required in the substantially oxygen-free carbonization process. This is because it can be done.

In the drying, thermal decomposition, and carbonization steps, the compression molded product is heated from the outside, and the water content evaporates until the temperature reaches about 100 ° C., and after drying, the temperature is further increased to perform thermal decomposition. On the other hand, drying, pyrolysis,
Although the amount of heat and the time required for drying in the carbonization step vary, the temperature-rise behavior of the compression-molded product after the drying is almost not significantly changed by the waste to be treated.

This is because, in the present invention, before the waste is dried, thermally decomposed and carbonized, the waste is tightly compressed so that its volume becomes about 1/10. In other words, the contact between the wastes becomes tight, the density becomes almost constant at all times, and the specific heat does not change so much as the specific heat per unit weight of the solid, so it is constant over time in the drying, pyrolysis, and carbonization processes. When heated at temperature,
After drying, the compression-molded product always shows almost the same temperature increasing behavior.

[0032] Thus, drying, pyrolysis, when using a tunnel type heating furnace as carbonizing step, controlled so as to properly maintain the temperature of compression molding was in a certain distance from the tunnel-type heating furnace inlet 4 _E in FIG. 5 described above if, tunnel furnace outlet: to hold the degree of carbonization of (spout carbide product to high temperatures reactor 5) carbonized product in 4 _O substantially constant.

FIG. 1 shows a tunnel type heating furnace 4 when wastes having different moisture contents are treated by the waste treatment equipment shown in FIG.
The result of measuring the center temperature of the cross section of the compression molded product perpendicular to the moving direction of the compression molded product in the inside is shown. In FIG. 3, reference numeral 16 denotes a combustible gas and an oxygen-containing gas inlet, and f ₉
Indicates the blowing direction of the combustible gas and the oxygen-containing gas, and the other symbols indicate the same contents as in FIG.

The temperature of the center of the compression molded article is measured by attaching the tip of a thermocouple to the center of the compression molded article, and connecting a compensating wire to the lower corner of the tunnel heating furnace. Was carried out by extending and moving in a pipe attached in the longitudinal direction of the pipe. From this measurement result, it was clarified that each waste undergoes the following temperature rise in the tunnel heating furnace due to the difference in the amount of water.

[Waste Plastic (Water: 5 wt%)] After passing through the tunnel heating furnace inlet 4 _E , the temperature of the waste plastic having a low water content (water: 5 wt%) rises shortly, and the waste plastic is discharged from the tunnel heating furnace outlet 4 _O. The temperature already reached 550 ° C. or more just before 4 m. [General household waste (moisture: 40wt%), garbage mixture ｛mixture of general household waste and organic sludge｝ (moisture: 60wt%)] The distance in the direction of the tunnel heating furnace required for drying varies depending on the amount of moisture But the tunnel heating furnace outlet 4 _O 7 ~
Finish drying at a position 10m before, and the central temperature of waste is 10
It reached 0-150 ° C.

Further, due to the subsequent temperature rise, the temperature exceeded 550 ° C. in the vicinity of the tunnel type heating furnace outlet 4 _O , and carbonization was substantially completed. [Organic sludge (water content: 85 wt%)] Moisture: For 85 wt% of organic sludge, drying is delayed, first exceeds the 100 ° C. at the time of the move to a position approximately near 4m tunnel type heating furnace outlet 4 _O, tunnel It was impossible to raise the temperature to 550 ° C. up to the heating furnace outlet 4 _O.

Further, in this case, the heat absorption due to the thermal decomposition of the organic matter in the insufficiently carbonized carbonized product causes the lowering of the temperature in the lower part of the furnace of the high-temperature reactor 5 and the combustion / melting zone in the lower part of the furnace of the high-temperature reactor 5. The amount of dust discharged outside the high-temperature reactor system increased due to the increase in gas generation in. From the results described above, when drying, thermal decomposition, and carbonization of a compression molded product are performed in a tunnel heating furnace, the tunnel heating furnace 4 having a total length of 14 m is 4 to 7 m from the entrance 4 _E of the tunnel heating furnace 4.
At a temperature of 100 to 15
By controlling the mixing ratio of the waste so as to be 0 ° C. and adjusting the water content, it is possible to always stably burn the waste and melt the ash in the high-temperature reactor.

The temperature rise curve of the compression molded product in the tunnel heating furnace 4 is similar even if the length of the tunnel heating furnace 4 is changed. When the pyrolysis and carbonization are performed in a tunnel heating furnace, the center temperature of the compression-molded product is at least 100 to 150 ° C. in at least any part of the area A defined by the following formula (1) in the tunnel heating furnace. It is preferable to control the mixing ratio of a plurality of types of wastes having different amounts of water so as to adjust the amount of water.

(2/7) L ≦ A ≦ (１ ／) L (1) [where L is the distance from the tunnel heating furnace inlet 4 _E to the tunnel heating furnace outlet 4 _O. Show. ]

[0040]

EXAMPLES The present invention will be described below more specifically based on examples. The waste disposal amount shown in FIG.
The waste treatment test of the present invention was performed using a waste treatment facility of the / d scale. In the following, [I.] Waste treatment equipment and method, and [II.] Waste treatment test results are described in this order.

[. I] [0041] Waste Treatment facility and waste disposal methods: cross-sectional shape of a tunnel type heating furnace inlet 4 _E inner wall in waste treatment equipment shown in FIG. 3, the width: 2000 mm, height: 500 meters
m is rectangular, the tunnel type heating furnace inlet 4 _E unit has a configuration in which a compression support plate 3 from above is inserted. After the waste is dropped into the compression device 1 from the waste inlet 20 with the compression support board 3 inserted, the compression cylinder 2
Pushing with a load of 00 t / m ² , the waste below the waste inlet 20 is compression molded.

As a result, the waste is compressed to a volume of about 1/10 between the compression cylinder 2 and the compression support plate 3 to obtain a compression molded product 10a. Obtained compression molded product 10a
Sectional shape is a cross-sectional shape and the same shape, the same dimensions of the tunnel type heating furnace inlet 4 _E inner wall, an inlet 4 _E is sealed by compression molding thereof. After compression, the compression support plate 3 is pulled out upward, and the compression cylinder 2 is further pushed in.
The compression molded product 10a obtained above is pushed into the tunnel heating furnace 4.

[0043] By pushing the new compression molded product from a tunnel type heating furnace inlet 4 _E, while already compressed molding material that is charged into the tunnel-type heating furnace is successively pushed sliding a tunnel type heating furnace 4 Moving. In this case, since the inner wall section of the cross-section and a tunnel type heating furnace inlet 4 _E compression molded product isomorphic, the same dimensions, the outer periphery and the inner wall of the tunnel furnace compression molded product when pushed into the tunnel furnace Are kept in close contact.

The tunnel heating furnace 4 has a length of 14 m,
The other end of the tunnel heating furnace is connected to a high temperature reactor 5. In the tunnel type heating furnace 4, the ceiling and floor are heated from outside by a gas heater, and the inner surface is heated to about 600 ° C. or more. As a result, the above-mentioned compression-molded product is dried while moving in a tunnel-type heating furnace, and partially thermally decomposed, and finally, carbonized products 11 including carbides such as organic substances, minerals, metals and the like. It becomes _n .

The volume of the obtained carbonized product 11 _n is smaller than that of the compression-molded product 10 a at the entrance 4 _E of the tunnel-type heating furnace, and moves while receiving pressure from the entrance 4 _{E of the} tunnel-type heating furnace. As shown in FIG. 3, a gap is formed at the upper part on the exit side of the tunnel heating furnace, and at the tunnel heating furnace outlet 4 _O , the carbonized product 11 _n is extruded into the high temperature reactor 5.

Carbonized products extruded from the tunnel heating furnace 4 are deposited in the high-temperature reactor 5, and the deposits are blown from an oxygen-containing gas blowing port 13 provided on the outer periphery of a lower portion of the high-temperature reactor 5. The oxygen-containing gas (: pure oxygen) is burned and pyrolyzed.
The lower furnace atmosphere temperature is maintained at about 1800 ° C. The upper part of the high-temperature reactor 5 is heated by the heat input by the mixed gas of the gas generated in the lower part of the furnace and the pyrolysis gas flowing from the inside of the tunnel type heating furnace 4 and the heat absorption by the thermal decomposition of the hydrocarbon gas.
It is maintained at about 00 ° C to 1350 ° C.

The temperature in the vicinity of the gas outlet 52 in the upper part of the high-temperature reactor 5 is kept at 1000 ° C. or higher. Residue after combustion and pyrolysis (:
Incombustibles) are melted in the lower part of the furnace by the combustion heat of LPG and pure oxygen supplied from the combustible gas and oxygen-containing gas inlet 16. The melted residue becomes molten metal and molten slag and accumulates in the hearth, and the molten material discharge port 14
Emitted from H.

Tunnel type heating furnace 4 for supplying carbonized product
The distance between the height of the lower end of the carbonized product extrusion port (: tunnel heating furnace outlet 4 _O ) and the height of the gas discharge port 52 at the connection between the gas and the high temperature reactor 5 is 14 m, and the combustion of the carbonized product is performed. The gas and dust generated by pyrolysis are sufficiently burned and pyrolyzed. [II.] Waste treatment test results: (Example 1) The waste treatment test of the present invention was performed using the waste treatment facility shown in FIG.

Table 1 shows the properties of the treated waste. In this embodiment, a tunnel type heating furnace 4 of total length 14m, as shown in FIG. 2 longitudinally 5 equal parts, from the inlet 4 _E of the tunnel type heating furnace 2.8 m, 5.6 m, 8.4 m, of 11.2m The tip of a thermocouple was attached to the concave space on the inner wall surface of the tunnel heating furnace at each position, and the temperature was measured.

In addition, the tip of the gas sampling nozzle was placed in the concave portion of the upper wall at the above-mentioned positions of 2.8 m and 8.4 m, the gas was sampled, and the presence or absence of the progress of thermal decomposition was examined. Temperature of the position of 2.8m from the inlet 4 _E of the tunnel type heating furnace to about
Although stable at 300 ° C, the entrance of tunnel heating furnace _4E
The temperature at 5.6m, 8.4m and 11.2m from the above varied depending on the type of waste supplied.

Therefore, the temperature at the position of 5.6 m is 400 ° C.
The mixing ratio of waste plastic and inorganic sludge was controlled over time so that the temperature at 11.2 m was almost stable at 500 ° C. As a result, the tunnel heating furnace entrance _4E to 4E
Center temperature becomes the 100 to 150 DEG ° C. for at least the compression-molded product in any position of ~7m in the area, the center temperature of the tunnel furnace outlet 4 _O just before the carbonization product 500-60
Maintained at 0 ° C.

Table 2 shows the obtained test results. In this test, the flammable gas and oxygen-containing gas
Thus, the temperature of the high-temperature reactor 5 was stably maintained at a high temperature without injecting LPG, and the fluctuation of the amount of gas generated on the exit side of the high-temperature reactor could be reduced. Moreover, since it was possible to perform the high-temperature combustion, also the amount of dioxins generated gas of high temperature reactor outlet side, regulations: 1/10 of 0.1ng-TEQ / Nm ³
11/5, indicating that the waste disposal method of the present invention is excellent in environmental conservation.

(Example 2) In Example 1 described above,
Instead of waste plastic and inorganic sludge, shredder dust and organic sludge having the properties shown in Table 1 were used, and the same method as in Example 1 was used except that the mixing ratio of shredder dust and organic sludge was controlled over time. A treatment test was performed.

Table 2 shows the test results obtained. As shown in Table 2, also in this example, the temperature of the high-temperature reactor 5 was stably maintained at a high temperature without injecting LPG from the flammable gas and oxygen-containing gas injection ports 15 and the high-temperature reactor was discharged. The variation in the amount of gas generated on the side can be reduced,
The amount of dioxins in the gas generated at the outlet of the high-temperature reactor was also reduced to one-tenth that of the law.

(Comparative Example) Using the waste treatment equipment shown in FIG. 3, compounding waste plastic, shredder dust, organic sludge, and inorganic sludge having the properties shown in Table 1 in the same manner as in the conventional method. And processed sequentially. Table 2 shows the obtained test results.

In this test, the temperature of the high-temperature reactor 5 was lowered, and the temperature of the high-temperature reactor 5 fluctuated with time. Accordingly, it is necessary to supply the LPG for heat compensation from the flammable gas and oxygen-containing gas inlet 15 and to control the supply rate of the waste. Further, the amount of generated gas on the outlet side of the high-temperature reactor fluctuates greatly with time, and it is necessary to control the supply rate of the waste in accordance with the set upper limit of the amount of generated gas.

[0057]

[Table 1]

[0058]

[Table 2]

[0059]

According to the present invention, it is possible to significantly reduce the amount of fuel required for heat compensation, stably burn waste, and melt ash when treating waste. . Furthermore, according to the present invention, it is possible to reduce the variation over time of the amount of gas generated on the outlet side of the high-temperature reactor, so that the waste supply speed can be set near the upper limit value, and the amount of waste disposal increases. It became possible.

[Brief description of the drawings]

FIG. 1 is a graph showing a temperature rise state of a waste compression molded product in a tunnel type heating furnace.

FIG. 2 is a side view of the tunnel heating furnace showing a temperature measurement position in the embodiment.

FIG. 3 is a side view showing a waste treatment facility.

FIG. 4 is a graph showing a relationship between moisture in waste and a lower calorific value of waste.

FIG. 5 is a side view showing a waste treatment facility.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compression device which pressurizes and compresses waste batchwise 2 Compression cylinder 3 Compression support board 4 Tunnel type heating furnace for drying, pyrolysis, and carbonization of compressed waste (: compression molding) 4a Compression pyrolysis drying area 4b compression molding of the molded product, carbonized region 4 _E tunnel furnace inlet 4 _O tunnel furnace outlet 5 hot reactor 10a, 10i compression molded product 11 _i, 11 _n compression molded product was carbonized ( : Carbonized product) 12 Mixture of carbonized product and combustion residue 13 Inlet of oxygen-containing gas 14 Melt 14H Melt outlet 15 Injection of combustible gas and oxygen-containing gas 16 Injection of combustible gas and oxygen-containing gas Mouth 20 Waste input port 21 Waste input port lid 50 Rapid cooling device for generated gas (: exhaust gas) discharged from high temperature reactor 51 Gas purification device 52 Gas exhaust port of high temperature reactor 53 Purified gas f ₁ Compression molded product transfer of the movement direction f ₂ carbonization product Moving direction f ₃ Flow direction of pyrolysis gas generated in the tunnel heating furnace f ₄ Direction of blowing oxygen-containing gas into the high-temperature reactor f ₅ Moving direction of the compression cylinder f ₆ Moving direction of the compression support plate f ₇ direction blowing waste inlet lid rotating direction f ₈ combustible gas and oxygen-containing gas blowing direction f ₉ combustible gas and oxygen-containing gas into the hot reactor in

Continued on the front page (51) Int.Cl. ⁶ Identification code FI F23G 5/02 ZAB F23G 5/02 ZABD 5/027 ZAB 5/027 ZABZ 5/14 ZAB 5/14 ZABD F23J 1/00 F23J 1/00 B (72) Inventor Fumihiro Miyoshi 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation (72) Inventor Masayasu Fukui 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation (72 ) Inventor Noboru Yasukawa 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Corporation

Claims (2)

[Claims] 1. A step of compression molding waste, a step of heating, drying, pyrolyzing, and carbonizing the obtained compression molded article;
A waste treatment method having a step of burning the obtained carbonized product and melting ash, wherein the waste to be subjected to the compression molding is a mixture of a plurality of types of wastes having different moisture contents. As described above, the temperature of the compression molded product in the drying, pyrolysis, and carbonizing steps is within a predetermined range,
A waste treatment method comprising controlling a compounding ratio of a plurality of types of wastes having different water contents. 2. A step of compression-molding the waste, a step of charging and moving the obtained compression-molded product into a tunnel-type heating furnace, and a step of drying, pyrolyzing, and carbonizing. What is claimed is: 1. A waste disposal method comprising a step of charging a high-temperature reactor, burning and melting ash, wherein the waste to be subjected to the compression molding is mixed with a plurality of types of wastes having different moisture contents. The water content is different so that the temperature of the compression-molded product is at least 100 to 150 ° C. in at least any part of the region A defined by the following formula (1) in the tunnel heating furnace. A waste treatment method comprising controlling the mixing ratio of a plurality of types of waste. (2/7) L ≦ A ≦ (1/2) L (1) [In the above formula, L indicates the distance from the entrance of the tunnel heating furnace to the exit of the tunnel heating furnace. ]